Plastics container assembly

Abstract

A plastics container assembly has a tubular wall 1 and a bottom end cap 2 fitted thereto to form a base. The wall 1 has an internal flexible and integral peripheral sealing flange 7 which is displaced by abutment with a closure wall 2a during fitting of the end cap to the side wall so that an annular rib 8 on the cap snap engages with an annular groove 5 in the side wall. A flange 12 on the bottom cap overlies the bottom end of the side wall 3 and may be permanently bonded thereto by welding. The flange 7 presents a smoothly curved concave profile 13 and provides a smooth transition 14 with the closure wall 2a. Fluid seals are provided by abutting surfaces between the rib 8 and groove 5, between the flange 12 and bottom of the wall 1 and between the sealing flange 7 and wall 2a. In a modification the annular rib is located on the wall 1 to snap engage with an annular groove in the cap 2 and the sealing flange 7 is omitted so that the smoothly curved concave profile is formed by an upward extension wall of the bottom cap 2.

I claim: 
     
       1. A plastics container assembly having an upstanding side wall and a base and which consists of a tubular wall part and a base closure part fitted to a bottom end of the wall part; one of the parts having a peripheral rib and the other part having a peripheral groove within which the rib is received to provide a fluid seal, said tubular wall part being held in snap-together engagement contact with said base closure part; one of said parts having a peripheral flange which closely overlies a peripheral bottom end face of the other part, and wherein inner surfaces of the wall part and closure part provide a smooth transition from one surface to the other and the effective peripheral junction within the container between the base and the side wall presents a smoothly curved concave profile. 
     
     
       2. An assembly as claimed in claim 1 in which the peripheral rib is a snap engagement within the peripheral groove. 
     
     
       3. An assembly as claimed in claim 1 in which the wall part and closure part are permanently bonded together. 
     
     
       4. An assembly as claimed in claim 3 in which the bonding is by adhesive or welding. 
     
     
       5. An assembly as claimed in claim 3 in which permanent bonding is provided between the peripheral flange and the bottom end face which it overlies. 
     
     
       6. An assembly as claimed in claim 1 in which the peripheral flange is external and located on the closure part to overlie the bottom end face of the wall part. 
     
     
       7. An assembly as claimed in claim 1 in which the closure part comprises a bottom wall which extends substantially. over the bottom of the interior of the container and a tubular extension wall which extends downwardly from the bottom wall within and adjacent to the tubular wall part. 
     
     
       8. An assembly as claimed in claim 7 in which the peripheral flange is external and located on the closure part to overlie the bottom end face of the wall part and said peripheral flange is located at the bottom of the tubular extension wall of the closure part. 
     
     
       9. An assembly as claimed in claim 1 in which the closure part comprises a bottom wall which extends substantially over the bottom of the interior of the container and said peripheral rib and groove engage substantially in the plane of said bottom wall. 
     
     
       10. An assembly as claimed in claim 1 in which the tubular wall part has an internal peripheral sealing flange adjacent to the closure part and which is directed from the side wall downwardly to the closure part, said sealing flange abutting the closure part to provide a fluid seal, to provide the smooth transition between the inner surfaces of the wall part and the closure part and to form at least part of the smoothly curved concave profile at the effective junction within the container between the base and the side wall. 
     
     
       11. An assembly as claimed in claim 10, in which the sealing flange reduces in its thickness to taper as it recedes from the side wall to provide said smooth transition. 
     
     
       12. An assembly as claimed in claim 10 in which the sealing flange is flexible. 
     
     
       13. An assembly as claimed in claim 12 in which the sealing flange is displaced into sealing abutment with the closure part during fitting of the closure part to the tubular wall part. 
     
     
       14. An assembly as claimed in claim 10 in which the closure part comprises a bottom wall which extends substantially over the bottom of the interior of the container and a tubular extension wall which extends upwardly from the bottom wall within and adjacent to the tubular wall part, and wherein a peripheral recess is formed in the tubular wall part beneath, and partly defined by, the sealing flange and said upward tubular extension wall is received within said peripheral recess whereby the sealing, flange overlies that upward extension wall. 
     
     
       15. An assembly as claimed in claim 14 in which the peripheral recess beneath the sealing flange receives the upward tubular extension wall in substantially complementary manner. 
     
     
       16. An assembly as claimed in claim 1 in which the tubular wall part is substantially cylindrical. 
     
     
       17. An assembly as claimed in claim 1 when fitted with an openable lid for the open top of the assembly. 
     
     
       18. A plastics container assembly having an upstanding side wall and a base and which consists of a tubular wall part and a base closure part fitted to a bottom end of the wall part; one of said parts having a peripheral rib and the other part having a peripheral groove within which the rib is received to provide a fluid seal;   one of said parts having a peripheral flange which closely overlies a peripheral bottom end face of the other part;   said tubular wall part having an internal peripheral sealing flange adjacent to the closure part, said sealing flange being directed downward from the side wall to abutt the closure part so as to provide a fluid seal and a smooth transition between the inner surfaces of said wall and closure parts, said abuttment also forming at least part of a smoothly curved concave profile presented by the effective peripheral junction between the base and the sidewall within the container, and   said closure part having a bottom wall extending substantially over the interior of the container bottom, a tubular extension wall extending upwardly from said bottom wall within and adjacent to the tubular wall part, said tubular wall part having a peripheral recess beneath and partly defined by the sealing flange, said upward tubular extension wall being receivable within said peripheral recess whereby the sealing flange overlies that upward extension wall.   
     
     
       19. An assembly as claimed in claim 18 in which the peripheral recess beneath the sealing flange receives the upward tubular extension wall in a substantially complementary manner.